united states postal tracking information United States Postal Service (USPS) tracking information allows customers to monitor the status of their packages as they move through the delivery network. By using a tracking number, USPS customers can check the delivery status, estimated delivery time, and any delays that may have occurred. Tracking is available for many USPS services, including First-Class Mail, Priority Mail, and Priority Mail Express. Customers can access tracking information via the USPS website or mobile app, providing real-time updates to ensure the package arrives on time.